Revert 266932 "GN build improvements."

trunk/src/third_party/wtl/BUILD.gn

Index: trunk/src/third_party/wtl/BUILD.gn
===================================================================
--- trunk/src/third_party/wtl/BUILD.gn	(revision 266932)
+++ trunk/src/third_party/wtl/BUILD.gn	(working copy)
@@ -1,14 +0,0 @@
-# Copyright (c) 2013 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-config("wtl_includes") {
-  include_dirs = [ "include" ]
-}
-
-# WTL is only header files so we use a "group" target type which doesn't
-# actually generate anything linkable, and inject the required config for
-# making the include directories work.
-group("wtl") {
-  all_dependent_configs = ":wtl_includes"
-}